Geoffrey b



(No Model.)

G. B; LEHY.

BURGLAR ALARM. No. 396,701. Patented Jan. 22, 1889.

M PETUIS, PhmvLilm n k-m. Wamingmn. D4 0.

UNITED STATES PATENT OFFICE.

GEOFFREY B. LEHY, OF MEDFORD, ASSIGSOR OF ONE-HALF TO BE XICE J. NOYES, OF BOSTON, MASSACHFSETTS.

B U RGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 396,701, dated January 22, 1889.

Application filed April 14, 1888.

Serial No. 270,693. (No model.)

To all whom it may (JON/0GP: l

Be it known that I, GEoEEREY B. LEHY, of Med'ford, county of Middlesex, State of Massachusetts, have invented an Improvement in Burglar-Alarms, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention has for its object to construct a lmrglaralarm for shades and ourtains and the like; and it consists in the combinatiomwith a ring, loop, or other pendant attached to a spring-actuated or spring-controlled shade or curtain, ot' a pivoted circuitchanging lever engaged by said ring and held in its abnormal position; also, in the combination, with a ring, loop, or other pendant attached to the spring-actuated shade or eurtain, of a pivoted lever to control the opera tion of an alarm, said lever being engaged and held in its abnormal position by said ring, loop, or otherpendant; also, in the combination, with the spring-actuated or springaeting circuit-changing device adapted to be engaged by a ring, loop, or other pendant attached to the curtain, to be thereby held in its abnormal position, of a guard or holder for said circuit-changing device; also, in details of construction to be hereinafter more fully pointed out.

Figure 1 shows in front elevation a burglar-alarm embodying this invention; Fig. 2, a vertical section of the burglar-alarm shown in Fig. 1, taken on dotted line 51; a Fig. 3, an under side view of the burglar-alarm shown in Fig.2; Figs. 1 and 5, modifications to be referred to.

The shade or curtain (1, its lower base-bar, a, the ring I), or it may be a loop or other pendant, and the window-sill c, are all as usual. To the under side of the window-sill c the circuit-changing device, which forms the essential feature of my invention, is secured. The circuit-changing device as shown in Fi 1, 2, and 3, consists of a block, 6, fixed to a basepla'te, c, by which the device may be secured to the under side of the window-sill c. The block 6 is slit-ted at its under side, within which slit is secured a spring-acting strip of metal or wire, e having its outer or free end bent as at e. The normal tendency of the spring-acting strip c is to protrude from the slot, bearing against the metallic bar or strip of wire e". For greater surety, as will be hereinafter desm'ibed, I have provided two such bars, c" F, altlumgh I have herein shown them as made of one and the same strip of wire, it being bent, as best shown in Fig. 3, to traverse the block e twice and then extend rearwardly along the under side of the block.

The device, when secured to the under side of a window-sill, c, is adapted to protrude a suiiicient distance to receive the ring I), and by the spring action of the shade or curtain (it being understood that a spring-actuated 65 or spring-controlled shade or curtain is employed) the strip 6* is lifted tree from the bar c", or between the bars 6:

The operation is as follows: If by any means the shade or curtain is moved after it has been duly locked and fastened, the ring will slip ol't' the block 6, and hence the strip 6 by its spring-like action strikes thebare". If the shade or curtain is tampered with, the tendency is to move the ring 7) outward slightly and the strip or lever 6" will be moved to strike the cross-bar It is designed that the device shall be connected in an electric circuit, and when the strip or lever e is in this intermediate position the circuit is opened; but when it is allowed or caused to strike or come in contact with either cross-bar e e the circuitwill be closed and the alarm sounded.

In Fig. l the lever is pivoted within the S5 block and normally held in contact with the contact-spring F by aspring, 1' The lever i protrudes sufticiently for engagement with the ring or other pendant ot' the curtain.

In Fig. 5 the lever a is pivoted to the block n and normally held in engagement with the cross-bar if by the spring a.

The operation of the circuit-ehanging devices in Figs. s and 5 is substantially the same as that shown and described in Figs. 1, 5

2, and I claim 5 1. In a burglar-alarm, the circuit-changing lever receiving upon it and being held in its 7 abnormal position by the pendant of a springloo actuated curtain or shade, substantially as described.

2. In a burglar-alarm, the spring-controlled circuit-changing lever, combined with the 4. In a burglar-alarm, the circuit-changing lever normally resting; on a contact and receiving the pendant of a curtain or shade, by which it is moved into and held in its abnormal position, substantially as described.

In testimony whereof -I have signed my name to this specification in the presence of two subscribing witnesses.

GEOFFREY B. LEHY.

\Yitnesses:

BERNICE J. NoYEs, B. DEwAR. 

